Brown rot is a mild common disease affecting the victim's strength and behavior. Symptoms include necrosis and sleeplessness. It may be contracted from the bonewalker, skeleton, greater bonewalker, or bonelord.

Chills is an extremely dangerous common disease affecting the victim's mind and coordination. Symptoms include clumsiness and mental confusion. It may be contracted from the bonewalker, skeleton, greater bonewalker, or bonelord.

Collywobbles is a serious common disease affecting a victim's strength, endurance, and mobility. Symptoms include uncontrollable shaking and chronic weariness. It may be contracted from the fiery shalk.

Helljoint is a mild common disease affecting a victim's mobility and dexterity. Symptoms include persistent irritation and inflammation of joints. It may be contracted from the girdle-tailed cliff racer.

Rockjoint is an acute common disease affecting a victim's manual dexterity. Symptoms include painful swelling and immobility of all joints. It may be contracted from the domesticated guar or dusky alit.

Swamp fever is a mild common disease affecting the victim's strength and behavior. It may be contracted from the mudcrab. The symptoms include high body temperature and delirium, but there are no easily visible signs.

There are also other diseases, called Blight diseases, in Morrowind. These are more serious, and slightly harder to cure. You will probably need a Cure Blight Disease spell (or items that provide this effect) if you venture into the Ashlands, Molag Amur, or Red Mountain areas, where these diseases are prevalent. A free version of this spell (with the lowest casting cost) can be obtained from the real Ashmask of Vivec. The use of Resist Blight Disease or Resist Magicka effects to protect yourself from catching these afflictions in the first place is recommended when engaging Blighted and Ash creatures.

Note: As with the common diseases, the values are the maximum it can affect you. The minimum is 20 for all Blight diseases.

Worst of all the afflictions is the dreaded Corprus Disease, also known as the "Divine Disease". While technically a type of Blight disease, it has (in lore) no known cure, although Divayth Fyr in Tel Fyr spends his days researching one in the Corprusarium.

Corprus is sometimes called the "Divine Disease" by followers of Dagoth Ur, and it is not truly a disease at all, but the physical effects of the deity's power on mortal flesh. Corprus metastases (i.e., big chunks of diseased flesh) are often eaten by the inflicted, negating any need for other food. It also plays a key role in the creation of Ash Creatures: followers of Dagoth Ur close to his power are slowly transformed into powerful Ash Creatures, such as the Ascended Sleeper, while his weaker followers, like the Dreamers, eventually rot and become Corprus Stalkers and Lame Corprus.

Corprus is a deadly disease profoundly affecting a victim's mind and body. Symptoms include dementia, violent behavior, and distorted, disfiguring skin growths. It may be contracted from corprus beasts or other blight monsters.